Worksheet 727 · Skill 5

Set and drift

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1. At 0910 your fix is 162°T, 1.6 nm from Tern Island tower. You steer 253°T at 4.6 kn through the water. At 1015 a new fix puts you 087°T, 2.9 nm from Westfield church spire.

   Plot the 1015 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1545 your fix is 013°T, 1.6 nm from Mill stack. You steer 048°T at 5.8 kn through the water. At 1640 a new fix puts you 030°T, 3.4 nm from Gannet Rock daybeacon.

   Plot the 1640 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1520 your fix is 251°T, 1.2 nm from Gannet Rock daybeacon. You steer 278°T at 7.8 kn through the water. At 1610 a new fix puts you 084°T, 1.1 nm from Westfield church spire.

   Plot the 1610 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0805 your fix is 045°T, 3.6 nm from Westfield church spire. You steer 185°T at 9.0 kn through the water. At 0840 a new fix puts you 329°T, 1.2 nm from Heron Point Light.

   Plot the 0840 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0845 your fix is 074°T, 1.7 nm from Heron Point Light. You steer 073°T at 4.1 kn through the water. At 0930 a new fix puts you 249°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 0930 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1515 your fix is 304°T, 4.3 nm from Tern Island tower. You steer 183°T at 4.6 kn through the water. At 1640 a new fix puts you 042°T, 2.0 nm from Heron Point Light.

   Plot the 1640 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0900 your fix is 263°T, 3.1 nm from Tern Island tower. You steer 213°T at 4.2 kn through the water. At 0950 a new fix puts you 334°T, 1.5 nm from Heron Point Light.

   Plot the 0950 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1335 your fix is 046°T, 2.6 nm from Westfield church spire. You steer 109°T at 5.2 kn through the water. At 1410 a new fix puts you 294°T, 2.5 nm from Tern Island tower.

   Plot the 1410 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn